|Choke|Constriction (Inch)|Percentage of lead shot in 30-inch circle at 40 yards|Identification (Notches)|Identification (Stars) (Spanish shotguns)|
|---|---|---|---|---|
|Cylinder|0.000|40 at 40 yd 70 at 25 yd|IIIII notches|***** stars|
|Skeet 1|0.005|45 at 40 yd 75 at 25 yd|||
|Improved  Cylinder|0.010|50|IIII notches|**** stars|
|Skeet 2 (light Mod.)|0.015|55|||
|Modified|0.020|60|III notches|*** stars|
|Improved Modified|0.025|65|II notches|** stars|
|Full|0.030|70|I notch|* star|
|Extra Full|0.040|73|I notch||
|Turkey|0.045 plus|75 plus|I notch||

Question: how many different chokes are there that start with an s
Answer: 2